-64 STATE BOARD OF A(4RICULTURE. 



It is not very likely tlmt these insects will prove injurious, as they seem to confine 

 themselves to the cut-back canes which are just throu','h bearing,', and which, in well 

 regulated fields, would be removed before the next year. No cases were seen where 

 the new jjrowth was attacked. In case this insect ever should become troublesome, 

 it can easily be kept in check by pruning. 



FORMULAS AND DIRECTIONS FOR USE OF INSECTICIDES.* 



PARIS GREEN. 



At the head of all the stomach poisons stands Paris green or arsenite of copper. 

 To prepare Paris green for spraying, slake one pound of well-burned quick lime in hot 

 water and stir in one pound of Paris green. Allow this mixture to stand over night, 

 strain, and then stir it into from 150 to 250 gallons of water. Keep the liquid well 

 stirred while spraying. For most insects, one pound to 200 gallons of water is sufTi- 

 cient, and at this rati? it will not injure the plant. Stone fruits, such as peach, plum 

 and cherry, should not receive a spray much stronger than this, but apples, pears, etc., 

 may be sprayed with a mixture considerably stronger, viz., one poiind to 150 gallons 

 of water. Potatoes may be sprayed "with one pound to 100 gallons of water. Paris 

 green is fairly imiform in composition if not adulterated, and is perhaps the safest 

 and surest remedy for chewing insects as a whole. 



DRY METHOD. 



While ordinarily it is most economical to use Paris green in the form of a spray, 

 in some instances, where only a few plants are to be treated or where no pump is avail- 

 able, it is expedient to use it as a dry powder. It should then be mixed at the rate of 

 one pound of the poison to 100 pounds of plaster, flour, or air-slaked lime, and dusted 

 on the plants through a sack of burlaps or some loose, coarse cloth, it is best to 

 make the application in the morning when the dew is on the plants. Never apply 

 dry poisons where the wind can blow the powder into pastures or places where cattle 

 or horses are feeding. 



Till-: KKD/.IE MIXTURE ( Ali.SEMCA). ) . 



An arsenical spray which has the advantage of being very cheap and uniform, as 

 well as efTective, is the Kedzie mixture, so named because it was originated by Dr. 

 Kedzie of the Agricult\iral College. In these days of adulterated Paris green, a uni- 

 form spraying mixture is highly appreciated. Dr. Kedzie, in giving directions for its 

 preparation, says: "Dissolve the arsenic by boiling with carbonate of soda, and thus 

 insur'e complete solution : which solution can be kept ready to make a spraying solu- 

 tion whenever needed. To make the material for eight hundred (800^ gallons of spray- 

 ing mixture, boil two pounds of white arsenic with eight (8) pounds of sal-soda 

 (crystals of carbonate of soda — 'washing soda'^ — found in CA'ery grocery and drug 

 shop) in two gallons of water. Boil these materials iix any iron pot not used for other 

 purposes. Boil for fifteen minvites or until the arsenic dissolves, leaving only a small 

 muddy sediment. Put this solution into a two-gallon jug and label 'Poison,' stock 

 material for spraying mixture. 



"The spraying mixture can l)e prepared whenever required, and in the quantitj' 

 needed at the time by slaking two pounds of lime, adding this to forty gallons of 

 water; pour into this a pint of the stock arsenic solution. IMix by stirring thoroughly, 

 and the spraying mixture is ready for use. The ar-senic in this mixture is equivalent 

 to four ounces of Paris green." 



Cost for 800 gallons spraying mixture: 



2 pounds white arsenic $0 25 



8 pounds sal -soda 25 



40 pounds lime 70 



Total $1 20 



* For further directions anil formulas for spraying see Bulletin 160 or Bulletin 175 of this department. 



